RSC Advances
·
2014
·Vol. 4
·期 100
·56791-56797
·
IF 3.708
Yulin Cui,Mei Tan,Aidi Zhu,Mingyu Guo
Strain hardening and high resilience are two unique mechanical characteristics of many soft biological hydrogels. However, these properties, especially the strain hardening behaviour, are generally not seen in synthetic polymer hydrogels. Here, hydrogels are prepared by free-radical copolymerization of acrylamide and chain-extended vinyl-modified pseudo-polyrotaxane, which acts as a multifunctional crosslinker. The reactive pseudo-polyrotaxane is based on a β-cyclodextrin monomer and amine-terminated PEG–PPG–PEG (Pluronic F127). The obtained hydrogels can be stretched from 10 to more than 26 times their original length before breaking and withstand a compression strain of 95% and even 98% without fracture. Tensile stretching tests show obvious strain hardening behaviours in high stretching and compression deformation regimes. The strain hardening behaviour in stretching deformation is considered to be the orientation and aggregation of the movable crosslinkers along the axial polymer backbone. Moreover, the formation of a second supramolecular network due to the chain-extension effect may also be responsible for it. Highly resilient behaviours with almost no hysteresis and residual strains are also observed even with a maximum strain of λ = 12 because of the inherent freely movable character of the crosslinkers.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Soft Matter
·
2018
·Vol. 14
·期 28
·5888-5897
·
IF 3.709
Si Yu Zheng,Ye Tian,Xin Ning Zhang,Miao Du,Yihu Song,Zi Liang Wu,Qiang Zheng
Hydrogel films have promising applications in medical dressings, flexible electronics, etc. However, it is challenging to fabricate ultrathin hydrogel films with high toughness and controllable thickness. Here, we report a facile approach to prepare tough physical hydrogel films by spin-coating of a poly(acrylic acid-co-acrylamide) (P(AAc-co-AAm)) solution and subsequent gelation in FeCl3 solution to form carboxyl–Fe3+ coordination complexes. The thickness of the obtained gel films, ranging from several to hundreds of micrometers, was easily tunable by adjusting the spin conditions and polymer concentration. The thus obtained hydrogel films showed excellent mechanical properties, with tensile breaking strengths of 0.6–14.5 MPa, breaking strains of 140–840%, Young's moduli of 0.1–61.7 MPa, and tearing fracture energies of 300–1300 J m−2. Based on this approach, responsive tough hydrogel films can also be prepared by spin-coating of a poly(acrylic acid-co-N-isopropylacrylamide) (P(AAc-co-NIPAm)) solution. The obtained gel films showed a fast response (<60 s) and a large output force (∼0.2 MPa) triggered by a concentrated saline solution, making them an ideal material in the design of chemomechanical devices. Furthermore, a bilayer hydrogel film was fabricated by two-step spin-coating of P(AAc-co-NIPAm) and P(AAc-co-AAm) solutions, which showed reversible bending deformation under external stimuli. This simple yet effective approach should be applicable to other systems to prepare versatile hydrogel films with tunable thickness and promising applications in diverse areas.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Xiayun Zhang,Ting-Ting Li,Yuxiao Wang,Bing-Chiuan Shiu,Hao-Kai Peng,Ching-Wen Lou,Jia-Horng Lin
In order to prepare a new high-performance and flexibility stab-resistant composite material, one type of high-toughness and high-strength hydrogel is combined with aramid fabric. In this paper, the nanocomposite (NC) hydrogels are prepared using Pluronic F127 Diacrylate (PF127DA) as the crosslinking agent, acrylamide as the monomer and nano-silica as nano additive. The influence of the addition amount of nano-silica on the toughness and strength of nano-composite hydrogels is discussed. The strength and toughness of the NC hydrogels with nano silica are higher than that of the acrylamide hydrogel without nano particles. The NC hydrogel with the best strength is made as a composite with aramid fabric and the effect of nanocomposite hydrogel on the stab resistance of the stab-resistant composite material is studied. The research shows that the stab resistance performance of the composite material prepared by aramid fabric and nanocomposite hydrogel is effectively improved in comparison with aramid fabric, and the yarn pulling force is also improved. The composite material with high stab resistance can be used as the stab-resistant layer of armor, cut-resistant gloves and stab-resistant base material of shoes. This work provided a possibility for preparing a kind of lightweight composite material with high stab resistance.
研究领域:
材料科学
·
复合材料
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产品关联
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 35
·2401622
·
IF 13
Jian Zou,Xin Jing,Shitao Li,Peiyong Feng,Yi Chen,Yuejun Liu
Single-network hydrogels are often too fragile to withstand mechanical loading, whereas double-network hydrogels typically exhibit significant hysteresis during cyclic stretching-releasing process due to the presence of a sacrificial network. Consequently, it is a considerable challenge for designing hydrogels that are both low in hysteresis and high in toughness for applications requiring dynamic mechanical loads. Herein, the study introduced a novel “sliding tangle island” strategy for creating tough and low-hysteresis hydrogels, which are prepared through in situ polymerization of highly concentrated acrylamides (AM) to form numerous entanglements within the MXene spacing without any chemical crosslinker. The MXene entangled with long polyacrylamide (PAM) chains to form tangle island that served as a relay station to transmit stress to neighboring molecular chains. This mechanism helps alleviate stress concentration and enhances energy dissipation efficiency, thereby reducing mechanical hysteresis. The resulting hydrogel exhibited exceptional properties, including high stretchability (≈900%), low hysteresis (less than 7%), high toughness (1.34 MJ m −3 ), and excellent sensing performance to rival the commercial hydrogel electrode. Therefore, this work sheds light on feasible design of energy dissipation structure to reduce the hysteresis of the composite hydrogels.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2025
·
IF 4.5
Xiansheng Tan,Wenting Deng,Shuhuan Feng,Tengfei Xu,Yuxin Wang,Jianhao Zhao,Jianhua Rong
For hydrogel applied in joint cartilage replacement, achieving both high toughness and low friction performance is a significant challenge. This study modifies polyvinyl alcohol hydrogel by using wet annealing and immersion methods. Wet annealing allows conformational rearrangement to improve crystallinity while maintaining the overall structure of the hydrogel. The immersion method induces the formation of tiny silica dioxide particles within the hydrogel. The mechanical properties of the hydrogel are greatly enhanced through the synergistic effect of these two mechanisms. Additionally, the introduction of mucin into the hydrogel achieves ultra-low lubrication performance through the brush-like oligosaccharide side chains and the negative charge saliva residues of mucin. The prepared hydrogel material not only exhibits excellent mechanical properties (tensile strength 5.11 MPa, tensile modulus 4.56 MPa, compressive strength 27.56 MPa, compressive modulus 2.04 MPa), but also maintains continuous lubrication and a low friction coefficient (0.037) under high loads (5 N) and high speeds (20 mm/s). The hydrogel maintains volume stability in a simulated body fluid environment for an extended period after swelling equilibrium. This method for preparing ultra-tough and lubricating hydrogels can offer valuable insights for researchers in the field.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Miaomiao Ma,Yuhong Qi,Qi’an Chen,Zhanping Zhang
Biofouling of underwater equipment caused by marine organisms is a major problem in the marine industry. Although hydrogel exhibits excellent antifouling properties, its mechanical performance greatly limits its practical application. In this work, a suitable marine antifouling hydrogel (PSM) was designed utilizing a polyethylene glycol–modified MXene (Ti 3 C 2 T x -PEG) toughening mechanism and a silica loaded with nitrogen-doped carbon dots (SiO 2 @N-CDs) reinforcement strategy to enhance the durability of the hydrogel. The PSM hydrogel exhibited a fracture strength of up to 1.62 MPa, elongation of 1734 %, and toughness of 17.7 MJ/m 3 . Furthermore, the PSM hydrogel exhibited excellent photothermal antibacterial properties, with antibacterial rates against E. coli and S. aureus reaching 100%. After 180 days of immersion in seawater, the PSM hydrogel morphology remained stable. Because of its long-term durability and effective antifouling properties, our PSM hydrogel can be developed for use in marine ship coatings.
研究领域:
材料科学
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生物医学工程
·
海洋科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Dejian Zhang,Zhiqiang Fang,Shuiqing Hu,Xueqing Qiu
Cellulose nanofibril (CNF) films with both high strength and high toughness are attractive for applications in energy, packaging, and flexible electronics. However, simultaneously achieving these mechanical properties remains a significant challenge. Herein, a multiscale structural optimization strategy is proposed to prepare high aspect ratio CNFs with reduced crystallinity for strong and tough films. Carboxymethylation coupled with mild mechanical disintegration is employed to modulate the multiscale structure of CNFs. The as-prepared CNFs feature an aspect ratio of >800 and a crystallinity of <60 %. The film prepared using CNFs with a high aspect ratio (~1100) and reduced crystallinity (~54 %) exhibits a tensile strength of 229.9 ± 9.9 MPa and toughness of 22.2 ± 1.4 MJ/m 3 . The underlying mechanism for balancing these mechanical properties is unveiled. The high aspect ratio of the CNFs facilitates the transfer and distribution of local stress, thus endowing the corresponding film with high strength and toughness. Moreover, the low crystallinity of the CNFs permits the movement of the cellulose chains in the amorphous regions, thereby dissipating energy and finally increasing the film toughness. This work introduces an innovative and straightforward method for producing strong and tough CNF films, paving the way for their broader applications.
研究领域:
材料科学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yugui Cheng,Simian Fu,Kaiming Jin,Yiying Liu,Jingtong Ma,Deliang Li,Qingying Lyu,Yehan Li,Xiaoyang Jiang,Ruonan Liu,Ye Tian
Hydrogels displaying both high toughness and flexibility hold substantial practical value. However, it has been challenging to achieve these properties simultaneously. To address this challenge, we developed a special structure hydrogel named PAB-S inspired by chrysalis shell. Astragalus polysaccharide (AP) was copolymerized with polyvinyl alcohol (PVA) and betaine hydrochloride (BH) to prepare a low-modulus hydrogel, PAB. Subsequently, surface modification of the PAB hydrogel using sodium phytate (SP) resulted in the formation of the “shell” structured PAB-S hydrogel. The fracture strength of the shell-structured hydrogel increased by about 0.8 MPa. Meanwhile, PAB-S had a maximum tensile strain of 418 %, a toughness of 6.82 MJ/m 3 , and a modulus of elasticity of approximately 0.6 MPa. In addition, PAB-S hydrogel offers high strain sensitivity (GF up to 4.7), ultra-low response time of 20 ms. Finally, leveraging 2.4G communication technology and a deep learning (1D-CNN) algorithm, advanced functionalities such as wireless remote intelligent control, and deep learning-based finger grip disorder identification were realized using the PAB-S hydrogel sensor. The PAB-S hydrogel sensor holds promising prospects for applications in fields including deep learning, intelligent sensing, medical rehabilitation, and human–machine synchronization.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
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产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 26
·16615-16623
·
IF 4.036
Gaobo Lou,Qing Li,Qian Jin,Qingqing Rao,Shenyuan Fu,Jinfeng Dai
Solid epoxy resin is highly desired in adhesives, electronic materials and coatings due to the attractive characteristics of solvent-free, highly efficient utilization and convenient storage and transportation. However, the challenges remain in fabricating high-toughness solid epoxy resin through a facile and efficient way. Here, a high-performance environment-friendly solid epoxy resin was fabricated by employing maleic anhydride grafted ethylene-vinyl acetate copolymer (EVA-g-MAH) as the flexibilizer via one-step banburying method. The results showed that the modified epoxy resin maintained a high glass transition temperature (Tg) and thermal stability, while its impact strength, tensile toughness and flexural toughness were significantly increased compared with the neat epoxy resin. The impact strength, tensile toughness and flexural toughness of R-EM10 are improved 138%, 195% and 149%, respectively. The EVA-g-MAH was introduced in the epoxy matrix as a separate phase to increase toughness via transfer stress and dissipated energy. The attractive properties of this facile fabrication process and the high-toughness, as well as the environment-friendly performance make this solid epoxy highly promising for large-scale industrial application.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haiquan Zhang,Houji Liu,Xin Li,Shuliang Li,Xin Wu,Renjuan Wang,Ning Wang,Kuzin Victor Fedorovich,Xianmin Mai
In the development of elastic materials, the non-synergy between stretchability and toughness is a challenge. Herein, we propose a rational design of a composite hydrogel by introducing strongly polarized hydrated Li-ion clusters, electron-withdrawing carboxyl groups , and Sn(II) complexation into hydrogen-bonded poly(acrylamide) (PAM) network. Weak interaction between Li-ions and amide groups facilitates the rapid flipping and slipping of the PAM chains during stretching, optimizing the stretchability of the hydrogel. This composite also provides an energy-dispersing mechanism based on strong ionic complexation between Sn(II) and amide groups, which improves its toughness. As-prepared composite hydrogel simultaneously exhibits high stretchability (>7000% elongation), ultra toughness of 580 kPa, excellent fatigue resistance and extreme temperature resistance (elastic at − 60 and 70 °C). Due to its excellent comprehensive performances, the present soft material has broad application prospects in agriculture, medicine, construction, and machinery.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Haoxiang Rong,Minhui Wang,Yanan Zhang,Xun Lu
As a functional material , the transparent elastomers have been rapidly developed and applied in different fields, such as electroluminescence devices, sensors, medical and communication equipment. However, it is a huge challenge to prepare the transparent elastomers with excellent room-temperature self-healing performance and high mechanical performance. Herein, based on the synergy effect of quadruple dynamic reversible interaction, we proposed a new strategy to synthesize a room-temperature self-healing polyurethane elastomer with high strength of 15.3 MPa, high elongation at break of 1232% and high transparency. First, the polyurethane elastomer exhibited high elongation and toughness based on mechanical energy consumption from reversible fracture and reformation of sacrifice bonds, including hydrogen bonds and coordinate bonds. Moreover, the rapid reversible reaction of boronic ester bonds, oxime bonds and especially hydrogen bonds endowed the elastomer excellent self-healing performance. After introducing coordinate bonds, the elastomer exhibited high strength based on increased hard segment microdomains and the microphase separation. To further probe the mechanisms of room-temperature self-healing process and high mechanical performance, the molecular chain mobility was studied. The relationship among molecular chain mobility, molecule chain entanglement, microphase separation and aggregation structure were revealed, indicating molecular chain mobility was the key factor to self-healing performance in polyurethane elastomer.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
He Ji,Shouhua Feng,Ming Yang
Polymer fibers that combine high toughness and heat resistance are hard to achieve, which, however, hold tremendous promise in demanding applications such as aerospace and military. This prohibitive design task exists due to the opposing property dependencies on chain dynamics because traditional heat-resistant materials with rigid molecular structures typically lack the mechanism of energy dissipation. Aramid nanofibers have received great attention as high-performance nanoscale building units due to their intriguing mechanical and thermal properties, but their distinct structural features are yet to be fully captured. We show that aramid nanofibers form nanoscale crimps during the removal of water, which primarily resides at the defect planes of pleated sheets, where the folding can occur. The precise control of such a structural relaxation can be realized by exerting axial loadings on hydrogel fibers, which allows the emergence of aramid fibers with varying angles of crimps. These crimped fibers integrate high toughness with heat resistance, thanks to the extensible nature of nanoscale crimps with rigid molecular structures of poly(p-phenylene terephthalamide), promising as a template for stable stretchable electronics. The tensile strength/modulus (392–944 MPa/11–29 GPa), stretchability (25–163%), and toughness (154–445 MJ/cm3) are achieved according to the degree of crimping. Intriguingly, a toughness of around 430 MJ/m3 can be maintained after calcination below the relaxation temperature (259 °C) for 50 h. Even after calcination at 300 °C for 10 h, a toughness of 310 MJ/m3 is kept, outperforming existing polymer materials. Our multiscale design strategy based on water-bearing aramid nanofibers provides a potent pathway for tackling the challenge for achieving conflicting property combinations.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）